Al Qaeda leader Ayman al-Zawahiri called Wednesday on Muslims to attack U.S., European, Israeli and Russian targets in a speech on the 18th anniversary of the 9/11 terror attacks.

SITE Intelligence Group, which tracks online activity of jihadist groups, reported that in a video released by the militant group, the 68-year-old al-Zawahiri also criticizes “backtrackers” from jihad, referring to former jihadis who changed their views in prison and called the 9/11 attacks unacceptable because innocent civilians were harmed.